Coherent excitation of a $\mu$Hz scale optical magnetic quadrupole transition

Abstract

We report on the coherent excitation of the ultranarrow ${}^1{\mathrm{S}}_0$-${}^3{\mathrm{P}}_2$ magnetic quadrupole transition in ${}^{88}\mathrm{Sr}$. By confining atoms in a state insensitive optical lattice, we achieve excitation fractions of 97(1)% and observe linewidths as narrow as 58(1) Hz. With Ramsey spectroscopy, we find coherence times of 14(1) ms, which can be extended to 266(36) ms using a spin-echo sequence. We determine the linewidth of the M2 transition to 24(7) $\mu$Hz, confirming longstanding theoretical predictions. These results establish an additional clock transition in strontium and pave the way for applications of the metastable ${}^3{\mathrm{P}}_2$ state in quantum computing and quantum simulations.

6 pages, 4 figures, 5 pages supplemental material

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Cited by in corpus (7)

• Modeling of a continuous superradiant laser on the sub-mHz ${}^1$S${}_0\to {}^3$P${}_0$ transition in neutral strontium-88
• Realization of a fast triple-magic all-optical qutrit in strontium-88
• Orders-of-magnitude improvement in precision spectroscopy of an inner-shell orbital clock transition in neutral ytterbium
• Dark spin-cats as biased qubits
• Collinear Three-Photon Excitation of a Strongly Forbidden Optical Clock Transition
• Isotope-agnostic motional ground-state cooling of neutral Yb atoms
• Differential polarizability at 1064 nm of the strontium intercombination transition